maybe he has jsut beenbusy over the holidays so hasnt had tome to get online and talk to you. next time that he is online or you see him talk to him about how you feel and ask him (kindly) why he hasnt been replying to your messages, maybe if you have been texting him he has run out of credit or somthing.

dont break up with him if you dont want to as overall its only a little thing you shouldnt get worked up about. just confront him when ever possible and find out whats going there is proberly a reasonable excuse to why he isnt replying.

sounds like my last ex. he took me for granted, stopped trying, didnt make any effort and if he liked me enough or if anything was ever gonna work in the future he would have had to have liked me more than talking to me only every two weeks when i texted him. i would move on, i know its hard and sounds hrashm but you can do better than someone who cant take time to contact his gf or at least gove an explanation. maybe youll show him you dont need him and he will want you back and work harder-also happened with the ex when i broke it off.